Cabbttreter



C. D. SMITH.

CARBURETER.

APPLICATION FILED MAY 19. 1915.

1 l 95, l l 3 Patented Aug. 15, 1916.

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CHARLES D. SMITH, OF DAYTON, OHIO, ASSIGNOR ONE-HALF T0 LOUIS MORNER, OF DAYTON, OHIO.

CARBURETER.

Specification of Letters Patent.

Patented Aug. 15, 1916.

To all whom it may concern:

Be it known that I, CHARLES D. SMITH, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Carbureters; and I do declare the following to be a full, clear, and exact description of. the invention, such as will enable others skilled 1n the art to which it appertains to make and use the same, reference being had to the accoinpanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to improvements 1n carbureters.

The object of the invention is to provide a carbureter that is highly efficient in its operation and readily responsive to the requirements necessary to the easy starting of the engine and, further, to provide a carbureter in which the consumption of gasolene is reduced to a minimum.

In the accompanying drawing, Figure 1 is a vertical section of my improved carbureter; Fig. 2 is a similar section at vrlght angles to Fig. 1; Fig. 3 is a horizontal s ectional view on the line aa of Fig. 1;-F1g. 4: is a detail view of the feed valve adjusting means; Fig. 5 is a detail view of the same; Fig. 6 is a detail View of the feed valve and its casing.

In a detail description of the invention, similar reference characters indicate corresponding parts throughout the specification and the drawings.

The casing comprises two members, to wit, an outer shelll and an inner tubular member 2, the latter having a flange 5 which forms a cap that engages the upper margm of the shell 1 and a lower annular flange 4: which engages the lower marginal portion 1 of the shell, there being a packing ring 1" interposed between said flanged and the margin 1". A spider 3 projects from the inner circumference of the tubular member 2. A Venturi tube 6 is mounted within the lower portion of the tubular member and screws into the spider 3. The lower portion of the 'Venturi tube 6 is also screwthreaded to receive asupplementary or auxiliary valve seat 8 which screws against the lower end of the tube 2 and shell 1 and firmly unites said shell and tube, there being a slight clearance between the valve seat 8 and the extreme lower end of the tube 2. The valve seat 8 comprises means for binding the shells together. The supplementary or auxiliary valve seat 8 has a series of air ports 8 therein above which a supplemental air valve 9 seats. Between the valve 9 and the spider 3, a coil spring lOmay be arranged to exert a closing pressure on the valve 9. An adjusting screw 7 extends through the valve 9 in alinement with one of. the arms of the spider 3 and serves to limit the opening movement of said valve. A needle-valve let is arranged in a slanting position across the throat offthe Venturi tube from the cover 5. The point of said valve seats in the end of a gasolene intake or nozzle 13 which slants and communicates with the gasolene chamber 18. The constant supply of air enters the lower end of the Venturi tube and intercepts the point of admission of the gasolene through the nozzle 13 at the throat of said Venturi tube. A sleeve 15 incloses the needle-valve to the point where it projects into the nozzle 13. The sleeve 15 is supported in an offset on the cover 5, and the outer end of said sleeve is enlarged as at 19. A spring 22 surrounds the outer end of the needle-valve with the part 19 and is interposed between the inner end of said enlarged part 19 and a washer 12 carried on the end of the needlevalve. An adjusting screw 25 engages the washer 12 to adjust the needle-valve, said screw 25 being supported by a cap 24 which fits against the enlarged part. 19. By this .means the needle-valve is primarily adjusted with reference to its seat in the end of the gasolene inlet nozzle 13. This is the primary setting of the needle for low feed.

Automatically controlled means for adjusting the needle-valve 14 in responding to the demands of the engine comprises a helical groove 16 in the inner end of the sleeve 15 through which a stud or pin 21 projects from said valve. The stud 21, as shown in Fig. 6, projects some distance beyond the surface of the sleeve 15 so that it may be engaged by the end of an arm 17 which extends from the supplemental air valve 9. It will be understood that when the condi tions are such that the supplemental air valve 9 rises from its seat, the arm 17 will cause the stud 21 to ride in the helical groove 16 thereby operating to choke or reduce the feed of gasolene. It will be understood that the supplemental air valve 9 admits air around the Venturi tube at this time, and the needle is moved toward its seat, and that the suction created through the Venturi tube is increased, whereby the feed of gasolene, which would tend to be proportionately augmented, is diminished to give a proper proportion for high speeds. This automatic adjustment of the needlevalve through the movement of the supplemental air valve 9 is responsive to the demands made by the engine, as will be readily understood. It will be understood that the expansion of the spring 22 occurs when the air valve 9 is returned to its seat and the arm 17 is returned to its normal position.

I have described the means whereby the needle-valve 14 is originally set or adjusted relative to the gasolene intake nozzle 13, also the means whereby the movement of the needle-valve relative to the end of the intake nozzle is automatically adjusted in response to the demands of the engine and I will now describe means whereby the relative initial position of the helical groove 16 of the valve stud 21 may be determined.

Referring to Figs. 4, 5 and 6 of the drawings, it is there shown that the enlarged tubular extremity 19 of the valve sleeve 15 is provided with a series of worm teeth 20 which are engaged by a worm screw 34: on the end of which a knurled head 35 is placed for turning said screw 35 by the fingers. The Worm screw 3a is mounted in a bearing 36 ofi'set on the upper side of the casing cover 5. By turning said worm screw, it will be apparent that the sleeve 15 will be accordingly rotated an amount equal to the amount of movement given said worm screw and it therefore follows that the position of the helical groove 16 relative to the stud 21 may be varied and the amount of movement imparted to the needle-valve through the engagement of the valve arm 17 with the stud 21 may be accordingly regulated. The usual float 37 within the gasolene chamber provided between the outer shell 1 and the inner tubular member 2 has connected to it an arm 38 pivoted at 39 within the tubular offset of the shell. The portion of the arm 38 beyond its pivot 39 is connected with the gasoleneintake valve 40 which cooperates with a tube 41 mounted over the orifice of the intake nozzle 42, it being understood that the intake nozzle 42 is connected in the usual. manner to the source of gasolene supply.

While I have described with some minuteness the various mechanical elements both as'to their functions and as to their structural characteristics, it will be understood that the structural characteristics may be to Having described my invention, I claim:

1. In a carbureter, the combination with an outer shell, an inner tubular member mounted therein, a Venturi tube mounted in said inner tubular member, of a needle valve and nozzle cooperating therewith and arranged obliquely in the contracted por tion of said Venturi tube, said needle-valve having a stud, a sleeve having a helical slot cooperating with said stud, said sleeve inclosing said needle-valve, an air valve, and means arranged between, the said air valve and the needle-valve within said sleeve whereby said needle-valve is given movement corresponding to the extent of the opening of said air valve, substantially as specified.

2. In a carbureter, the combination with an outer shell, an inner tubular member supported thereon forming a gasolene chamber, a Venturi tube mounted in said inner tubular member and forming a primary air inlet, and a supplementary air valve, of a needle-valve and a nozzle cooperating therewith and arranged obliquely in the upper portion of said Venturi tube, a sleeve inclosing said needle-valve and having a helical groove therein, a stud projecting, from said needle-valve through the slot in said sleeve, and an arm extending from said supplementary air valve and adapted to engage said stud when said air valve opens, whereby the position of the needle-valve relative to the nozzle is varied according to the extent of opening of the air valve, substantially as specified.

3. In a carbureter, the combination with an outer shell, and an inner tubular member supported therein, of a Venturi tube forming a primary air inlet, an inlet tube supported in said inner tubular member and extending obliquely into said Venturi tube, a needlevalve and a nozzle cooperating therewith and extending obliquely into said Venturi tube and cooperating with said inlet-tube in admitting gasolene, a sleeve inclosing said needle-valve having a helical groove,

a stud secured to said needle-valve and projecting through said helical groove, a supplementary air valve on the lower portion of said Venturi tube, means for adjusting said sleeve to vary the relative positions of said stud and slot, and a member extending from said air valve in a position to engage said stud whereby the needle valve is moved to a position to choke the feed of gasolene by the admission of the increased quantity of air at such time, substantially as specified.

4. In a carbureter, the combination with an outer shell, and an inner tubular member mounted therein and forming a gaso= lene chamber, of a Venturi tube mounted in said inner tubular member and forming an air inlet, an inlet tube supported in said inner tube and forming an inlet from the gasolene chamber to the Venturi tube, a needle-valve and a nozzle coiiperating therewith and mounted in said Venturi tube and cooperating with said inlet tube, a sleeve inclosing said needle-valve having a helical slot therein, a stud secured to said needle-valve and projecting through said helical slot, means for adjusting the relative positions of said stud and helical slot, a supplemental air valve, an arm thereon adapted to engage said stud when the air valve rises from its seat, and means for adjusting said sleeve whereby the amount of movement given the needle-valve through the engagement of the stud thereof may be varied, substantially as specified.

5. In a carbureter, the combination with an outer shell, and an inner tubular member forming a gasolene chamber, of a Venturi tube, an inlet tube mounted obliquely in said Venturi tube and communicating with said gasolene chamber, an oblique needle-valve and a nozzle cooperating therewith and mounted in said Venturi tube and coiiperating with said inlet tube in admitting gasolene, a sleeve inclosing said needle-valve having a helical groove, a stud secured to said needle-valve and penetrating said helical slot, a screw for setting the initial position of said stud in said slot, an air valve, means thereon engaging said stud and moving said needle-valve relative to the nozzle whereby said needle-valve is opened in proportion to the air admitted through said valve, and an adjusting gear engaging said sleeve whereby said sleeve is adjustable to vary the relative position of said helical slot, substantially as specified.

6. The combination with a shell, of a Venturi tube mounted therein, a needle valve and nozzle arranged obliquely within said Venturi tube and controlling the feed of gasolene, a supplementary air valve surrounding said Venturi tube, and means interposed between said air valve and said needle valve whereby the needle valve is moved toward the cooperating nozzle when the admission of air increases through said air valve.

In testimony whereof I aflix my signature.

CHARLES D. SMITH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

